Yota is a high school boy who loves sweets and fried food. His lunch at school usually consists of pastries or fast food. How can he change his unhealthy eating habits!?

After Yota's parents decided on an arranged marriage for him, a hand-made bento box came unexpectedly from his fiancee. When he ate the bento, it tasted better than anything he's ever eaten…

He has never met her, he doesn't even know her name, but his secret relationship with his mysterious fiancee has begun.

甘い物と揚げ物が大好き、学校の昼食は菓子パンやファストフード。
そんな不健康極まりない高校生・陽太（ようた）の食生活がついに矯正される!?

親が決めた婚約者から突然届いた手作り弁当。
恐る恐る食べてみたら、これまでにないほど美味しくて…

会ったこともない、名前も知らない、
謎に包まれた婚約者と秘密のやり取りがスタート♡